A050771 Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 4 skipped primes.

8, 9, 34, 38, 51, 65, 68, 85, 96, 116, 143, 224, 225, 304, 306, 416, 448, 544, 546, 570, 600, 621, 640, 714, 783, 810, 1020, 1134, 1197, 1254, 1280, 1408, 1521, 1540, 1666, 1716, 1806, 1900, 1953, 2088, 2646, 2760, 3159, 3185, 3255, 3392, 3920, 3968, 4176

Offset

0,1

Links

Table of n, a(n) for n=0..48.

Example

a(2)=9 + (3+3) = 15 + (3+5) = ending prime 23. Between 9 and 23 one finds 4 primes 11, 13, 17 and 19.

Crossrefs

Cf. A050703, A050710.

Sequence in context: A371443 A038344 A306162 * A120776 A041136 A041915

Adjacent sequences: A050768 A050769 A050770 * A050772 A050773 A050774

Keyword

nonn

Author

Patrick De Geest, Sep 15 1999

Status

approved